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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Wednesday
• 
• High: 84 °
• Low: 59 °
• Clear

• Thursday
• 
• High: 90 °
• Low: 64 °
• Clear

• Friday
• 
• High: 88 °
• Low: 68 °
• Chance of T-Storms

• Saturday
• 
• High: 100 °
• Low: 70 °
• Partly Cloudy

• Sunday
• 
• High: 99 °
• Low: 70 °
• Clear

Area forecast discussion...updated aviation 
National Weather Service St Louis MO 
634 PM CDT Tuesday may 22 2012 


Short term... 
issued at 319 PM CDT Tuesday may 22 2012 
(tonight and wednesday) 


Tranquil and dry weather pattern continues tgt and Wednesday as surface ridge 
currently extending from Lake Michigan SW in Arkansas moves slowly eastward. 
Despite the clear sky and relatively low surface dewpoints for late may 
low temperatures tgt should be slightly warmer than Monday night across 
much of the forecast area with weak low level warm air advection and 850 mb 
temperatures slowly rising from west to east. The coolest temperatures 
will be across southeastern MO and southwestern Illinois where the low level winds will 
still be light just west of the surface ridge axis. Much warmer...above 
normal temperatures can be expected on Wednesday as low level southerly winds 
increase and the 850 mb temperatures rise to about 15-17 degree c 
across our area by 00z Thursday. Little cloud cover is expected on 
Wednesday...may be some high level clouds. 


Gks 
&& 


Long term... 
issued at 319 PM CDT Tuesday may 22 2012 
(wednesday night through tuesday) 


Southerly flow in place over the region will continue to intensify 
toward the end of the week as a very strong high pressure system 
builds in just southeast of the area. Models are in good agreement 
regarding the position of the high over the middle Mississippi and 
Tennessee valleys...with 500mb heights now prognosticated to approach 5930 
to 5940m over the weekend...and corresponding 500mb temperatures in 
the +20c to +24c range. On Thursday night and into Friday...there 
is a slight chance for some thunderstorms across extreme northern 
Missouri in association with an area of enhanced moisture 
convergence and frontogenetical forcing. The GFS has continued to 
be the outlier regarding the precipitation forecast...wanting to 
bring precipitation as far south as middle Missouri due to shortwave 
interactions. However...have elected to side with the 
NAM...ECMWF..and sref output and keep precipitation confined to 
extreme northern counties in the County Warning Area. Beyond Thursday night and 
Friday...the majority of the Holiday weekend will be dry...with 
the next chance of precipitation associated with frontal passage Monday 
afternoon and into Monday evening. 


Jp 
&& 


Aviation... 
issued at 629 PM CDT Tuesday may 22 2012 


Dry...VFR conditions to persist as surface ridge to slowly move 
off to the east overnight. In the meantime...winds to remain light 
and variable...then pickup from the southeast to south on 
Wednesday to between 10 and 15 kts. 


Specifics for kstl...dry...VFR conditions to persist as surface ridge 
to slowly move off to the east overnight. In the meantime...winds 
to remain light and variable...then pickup from the south by 15z 
Wednesday to around 10 kts. 


Byrd 
&& 


Climate... 
issued at 313 PM CDT Monday may 21 2012 


Here is a list of record high temperatures for upcoming dates... 


... 
(5/24) (5/25) (5/26) (5/27) (5/28) 


St. Louis 92 93 98 93 93 
1950 1953 1953 1991 2006 


Columbia 94 93 93 92 91 
1911 1911 1953 1911 2006 


Quincy 94 95 95 94 94 
1921 1911 1911 1911 1914 


&& 


Lsx watches/warnings/advisories... 
MO...none. 
Illinois...none. 
&& 


$$ 
Weather forecast office lsx